Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 137, Issue -, Pages 71-77Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2016.11.026
Keywords
Co-adsorption; Phosphate; Perfluorooctane sulfonate; Temperature; Phosphate initial concentration; pH
Categories
Funding
- National Science Funds for Creative Research Groups of China [51421006]
- National Science Fund for Distinguished Young Scholars [51225901]
- Key Program of National Natural Science Foundation of China [41430751]
- National Natural Science Foundation of China [51379062, 51579073]
- National Key Plan for Research and Development of China [2016YFC0401703]
- Fundamental Research Funds for the Central Universities [2015B25314]
- Open Fund of Huaian Research Institute of Hohai University
- PAPD
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The co-presence of perfluorooctane sulfonate (PFOS) and phosphate in wastewater of various industries has been detected. Removing PFOS and phosphate simultaneously before discharging sewage into natural water can decrease effectively the environmental risk caused by the combined pollution of PFOS and phosphate. In this study, laboratory batch experiments were conducted for investigating the co-adsorption of PFOS and phosphate on boehmite and the influences of temperature, phosphate initial concentration and pH on the co-adsorption. The adsorption thermodynamics and kinetics of PFOS and phosphate on boehmite were also investigated completely and systematically. The results showed that lower temperature favored the co-adsorptions of PFOS and phosphate. The adsorption of PFOS and phosphate on boehmite agreed well with the Langmuir isotherm and the adsorption parameters of thermodynamics are Delta H=-16.9 and-20.0 kJ mol(-1) (PFOS and phosphate), Delta S =-5.69 and-7.63 J mol(-1) K-1 (PFOS and phosphate) and Delta G <0 (PFOS and phosphate). It demonstrated that the co-adsorption of PFOS and phosphate on boehmite is a spontaneously exothermic process. Moreover, the co-adsorption process can be described well by a pseudo-second-order kinetic model. With increasing phosphate initial concentration, more phosphate could be adsorbed on boelunite, while the adsorption of PFOS decreased at phosphate initial concentration of less than 30 mg L-1 and increased at that of larger than 30 mg L-1. In the co adsorption process, the adsorption amount of PFOS decreased with pH increasing, but that of phosphate changed little.
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